Micro-addition of Fe in highly alloyed Cu-Ti alloys to improve both formability and strength
Document Type
Article
Publication Date
1-1-2022
Abstract
Cu-Be alloys provide excellent electrical and mechanical properties, but present serious health hazards during manufacturing. Among alternative alloys, the Cu-Ti system has the highest yield strength; however, Ti cannot be easily solutionized at concentrations above 4 wt%, resulting in a relatively low formability. In this study, Cu-xTi-yFe (x = 3, 5, 6 wt% and y = 0, 0.3 wt%) alloys were studied after both solution-annealing and age-hardening through mechanical testing and microstructure analysis. Micro-additions of Fe kept high concentration of Ti in solid solution (up to 6 wt%) after water quenching and suppressed the classical “wave-like” early-stage precipitation. Instead, a new dispersion of nano precipitates was observed. This behavior results in doubling the ductility in the solution annealed state (up to 48% elongation), together with maintaining a very high strength after ageing (up to 975 MPa) from precipitation of metastable nano α-Cu4Ti. This study shows that Fe micro-additions, when combined with a higher amounts of Ti (6 wt%), enables the production of Cu-based alloys combining high formability and strength, providing an excellent alternative to Cu-Be in mechanical applications.
Publication Title
Materials and Design
Recommended Citation
Rouxel, B.,
Cayron, C.,
Bornand, J.,
Sanders, P.,
&
Logé, R.
(2022).
Micro-addition of Fe in highly alloyed Cu-Ti alloys to improve both formability and strength.
Materials and Design,
213.
http://doi.org/10.1016/j.matdes.2021.110340
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/15577